Sec.  73.157   Antenna testing during daytime.

   (a) The licensee of a station using a directional antenna during daytime or
   nighttime hours may, without further authority, operate during daytime hours
   with the licensed nighttime directional facilities or with a nondirectional
   antenna when conducting monitoring point field strength measurements or
   antenna proof of performance measurements.

   (b)  Operation  pursuant  to  this section is subject to the following
   conditions:

   (1) No harmful interference will be caused to any other station.

   (2) The FCC may notify the licensee to modify or cease such operation to
   resolve interference complaints or when such action may appear to be in the
   public interest, convenience and necessity.

   (3)  Such operation shall be undertaken only for the purpose of taking
   monitoring point field strength measurements or antenna proof of performance
   measurements,  and shall be restricted to the minimum time required to
   accomplish the measurements.

   (4) Operating power in the nondirectional mode shall be adjusted to the same
   power  as  was  utilized  for  the most recent nondirectional proof of
   performance covering the licensed facilities.

   [ 50 FR 30947 , July 31, 1985]